What’s the climate like in Siena?
The current climate of Siena features average monthly temperatures ranging from highs of 33°C during the day to lows of 11°C. The average yearly temperature is around 22°C. At night, temperatures in the colder months average around 3°C and in the warmer months around 19°C.
The highest temperature recorded in Siena in recent years was 41°C in August 2023. The lowest daytime temperature recorded was 0°C in February 2018.
On average, Siena gets 692 mm of precipitation each year. Of this, about 2,5 cm is snowfall. For comparison, London gets 701 mm of precipitation each year.
Curious about the climate in other parts of Italy? Check out the weather and climate in places like Tuscany, Sicily, Lake Garda, or have a look at other destinations in Italy.
Best time to visit Siena?
The best time to visit Siena for sunny weather is April through October. During this period, you'll have good temperatures and not too much rain, making it a great time to visit Siena. In the other months of the year, there's too much rain or the temperature isn't ideal for a visit if you want sunny and pleasant weather.
Climate Table of Siena
The climate table of Siena shows the average temperatures, precipitation, snow, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 11 | 14 | 16 | 20 | 23 | 29 | 33 | 32 | 27 | 22 | 16 | 12 |
| Temp. min (°C) | 4 | 5 | 6 | 9 | 13 | 17 | 20 | 20 | 16 | 12 | 9 | 5 |
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| Precipitation (mm) | 61 | 65 | 51 | 48 | 57 | 32 | 27 | 41 | 58 | 74 | 106 | 72 |
| Snow (cm) | 1,5 | 0,7 | 0,3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| UV Index | 4 | 5 | 6 | 7 | 8 | 8 | 8 | 8 | 7 | 5 | 4 | 3 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
- Average yearly temperature: 22°C
- Highest temperature: 33°C in July
- Lowest temperature: 11°C in January
- Precipitation*: 692 mm per year, averaging 58 mm per month
- Snowfall: 2,5 cm per year
- Driest months: 27 mm in July, 32 mm in June and 41 mm in August
- Wettest months: 106 mm in November, 74 mm in October and 72 mm in December
*Precipitation is measured as a combination of rain, snow, and hail
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Table of Contents
Average Temperature per Month in Siena
This graph shows the average maximum temperatures per month in Siena, Italy. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Siena
This graph shows how much precipitation Siena, Italy, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average Snowfall per Month in Siena
This graph shows how much snow Siena, Italy, gets on average per month. The amount of snowfall is measured in centimetres and the average is calculated based on the recorded snowfall per month from past years.
Average UV Index per Month in Siena
This graph shows the average UV index per month in Siena, Italy. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Yearly Temperature in Siena
This graph shows the average yearly temperature in Siena, Italy. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Siena
This chart shows the total yearly precipitation in Siena, Italy, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Total Yearly Snowfall in Siena
This chart shows the total yearly snowfall in Siena, Italy, over the past few years. The total yearly snowfall, measured in centimetres, is the sum of all the snow that fell in the twelve months of that year.
Weather experiences in Siena
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Average Weather in Siena by Month
Click on a month below to see detailed weather info for Siena. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
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